/Engine/Source/Runtime/Online/HTTP/Public/GenericPlatform/GenericPlatformHttp.h
Build the user agent string. Passing a filter will limit the comments to only those allowed. Passing nullptr for a filter implies that all comments are allowed.
[FString](API\Runtime\Core\Containers\FString) BuildUserAgentString ( const [TSet](API\Runtime\Core\Containers\TSet)< [FString](API\Runtime\Core\Containers\FString) > * AllowedProjectCommentsFilter, const [TSet](API\Runtime\Core\Containers\TSet)< [FString](API\Runtime\Core\Containers\FString) > * AllowedPlatformCommentsFilter ) const